For strictly street driving, engine mounts aren't completely necessary, but are also cheap relative to the benefit they provide. A
catch can is a great idea, as well as a
larger capacity clutch. You might be able to get away with the stock clutch for a while as long as you don't do any hard launches, but it will eventually give out. Any clutch that has a torque capacity of at least 250-275 ft-lbs should be fine for the street.
An upgraded radiator isn't strictly necessary unless you're tracking, and technically an oil cooler isn't either. I was using an oil-to-air oil cooler for a while, but my oil never got up to operating temperature while driving on the street, which is obviously not ideal (good read:
http://www.ft86club.com/forums/showthread.php?t=114293). If anything, an oil-to-water (i.e. OEM style coolant-based) oil cooler would be sufficient. If you are going to be taking the car to the track,
definitely get both an upgraded radiator and an oil-to-air oil cooler.
You should also think about upgrading injectors
only if you're going to be using ethanol. The OEM pump
does not actually need to be upgraded either way, regardless of what many people will likely say (source: I was pushing almost 400whp on ethanol with the OEM fuel pump for a long time.)